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&                        Unary Address operator;  Bitwise Binary AND operator

   &lvalue               Address of lvalue (used as unary address operator)
 or
   exp1 & exp2           Bitwise AND operator (used as binary AND operator)

    The & operator has two different meanings, depending upon its
    context.

    When used as a unary operator, & returns the address of a variable or
    function.  This value can then be assigned to any pointer; you may
    need to use a type-cast if the pointer you're assigning the address
    to has a different type than lvalue.  Here are two examples using &
    as a unary address operator:

           myptr = &i;
           myfncptr = &myfunc;

    When used as a binary operator, & performs a bit-by-bit AND operation
    on exp1 and exp2.  For example:

           i = 0x0FF0;
           j = 0xFF00;
           k = i & k;           /* k == 0x0F00 */